Reserved Instances, Savings Plans, and CUDs for Kubernetes
Blog post from Cast AI
The text provides a detailed exploration of commitment strategies for optimizing cloud computing costs, particularly in Kubernetes environments. It discusses the various commitment options offered by major cloud providers like AWS, GCP, and Azure, including Reserved Instances, Savings Plans, and Committed Use Discounts (CUDs), highlighting their discount rates and flexibility in adapting to changing workloads. The analysis emphasizes the importance of right-sizing and establishing a stable usage baseline before committing to these plans to avoid unnecessary costs, recommending a balanced approach where 60-70% of stable workload is committed, while the rest is managed using Spot or on-demand instances. It also explains how Kubernetes' dynamic nature, especially with autoscalers, affects the choice of commitment type, suggesting that spend-based plans are more adaptable to frequent instance type changes. The text underscores the significance of continuously monitoring and adjusting commitments to align with actual usage patterns to maximize savings over time.
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